Add AssignmentSource to BlimpClientContextImpl

blimp/client/core/android/java/src/org/chromium/blimp/core/BlimpClientContextImpl.java

Index: blimp/client/core/android/java/src/org/chromium/blimp/core/BlimpClientContextImpl.java
diff --git a/blimp/client/core/android/java/src/org/chromium/blimp/core/BlimpClientContextImpl.java b/blimp/client/core/android/java/src/org/chromium/blimp/core/BlimpClientContextImpl.java
index a71d95bedd80c8c50d0b44b3c94228c647332e5d..29f17a3cf98bdcfc5e44f387151450dfab8fe0f8 100644
--- a/blimp/client/core/android/java/src/org/chromium/blimp/core/BlimpClientContextImpl.java
+++ b/blimp/client/core/android/java/src/org/chromium/blimp/core/BlimpClientContextImpl.java
@@ -9,6 +9,7 @@ import android.preference.PreferenceFragment;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
 import org.chromium.blimp.core.settings.AboutBlimpPreferences;
+import org.chromium.blimp.core.settings.PreferencesUtil;
 import org.chromium.blimp_public.BlimpClientContext;
 import org.chromium.blimp_public.BlimpClientContextDelegate;
 import org.chromium.blimp_public.BlimpSettingsCallbacks;
@@ -83,6 +84,11 @@ public class BlimpClientContextImpl implements BlimpClientContext {
         return mNativeBlimpClientContextImplAndroid;
     }
 
+    @CalledByNative
+    private String getAssignerUrl() {
+        return PreferencesUtil.getLastUsedAssigner();
+    }
+
     private native BlimpContents nativeCreateBlimpContentsJava(
             long nativeBlimpClientContextImplAndroid);
 }